Improved woodesm pavement



H. MDoUGALL. WODEN PAVEMENT.

No. 75,780. Patented Mar. 24, 1868.

UNITED Sra'rns HU 1l-l MCDCI'GALL, OF CHICAGO, ILLINOIS, S'SI'GNOB TO HIMSELF, ROBERT STUART, AND COLL MCDOUGALL, OF SAME PLACE.

IMPROVED WOODEN PAVEMENT..

Specification forming part of Letters Patent No. $'5,?, dated March 24, 1868.

To all 'whom it may concern:

Be it known that I, HUGH MCDOUGALL, of the city ot Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in the Mode of Constructing lVood Iaveinents; and I do hereby declare that the following is a full, clear, and exact description of the same, ret'- erence being had to the accompanying draw# ings, making a part of this specification,ih which Figure l is a cross-section of .the street, showing the slotted guide in place; and Fig. 2,'a top or plan view of a portion of paved stre t.

Like letters refer to the same parts in both figures.

Heretofore great difficulty has been experienced in laying pavements upon the streets where the cells or channels for the reception of concrete extended to the foundation upon which the wooden blocks rest, for the reason that, when filling the channels, coarse gravel would topple over the unsupported blocks, unless they were all nailed or otherwise fastened to the foundation.

The nature of my invention consists in remedying this diiculty by using a slotted guide having a sucient number of openings to admit of partially filling the channels before the guide `'by which the blocks are laid in rows across the street is withdrawn, so that when the guide is withdrawn the lillng of the channels vwith concrete can be com pleted or rammed down without displacing the blocks, and without securing the blocks to the foundation, and in the construction of a slotted guide to facilitate the laying ofpavements when the cells or channels extend to the foundation.

To'enable others skilled in the art to con-I struct pavements by my' improved mode, I will proceed to describe it and the construction of the guide.

The earth, B, is suitably graded to the de sired configuration, and upon this is placed a board or other suitable foundation, D.

Before laying the blocks C,'I construct a slotted guide,A, by taking boards ten feet (more or lessl in length and about four inches in width, and nailing or otherwise securing thereto small pieces of wood, a, which are made of a thickness to correspond with the desired width of the channel, and aboutoue inch in width aud-about two inches apart, so as to leave about two-thirds of the channel open when the blocks ,are laid.

For the purpose of .greater ease iu withdrawing the guide, these projections or fmgers a a may he tapered at the inside toward the point, although it is not essential to its working.

I prepare enough of these to lay from three to six rows across the street, and it a suffi cient or large amount of work is to be done, it-.will he advisable to :make them of metal, for then the ngers a a can be made very thin, so as to leave scarcely any filling to he done after the guides are drawn out.

The lingers should project two or three inches above the height of the blocks C, so that the gravel can he shoveled under the bar A. into the channels.

I lay the first row of blocks across the street against any suitable support. I then place in front of such row a sufficient numher of my guides to reach across the streetor roadway. I then lay asecond row of vblocks against the fingers of the guides, and then place another row'of guides across the street, so on alternating with guides and blocks until four or five rows are laid. I then lill the channels between the fingers of the guides, leaving about two rows in front unfilled.

When the channels are illed the guides are withdrawn from the rear row and placed in front, and so 011,. repeating the operation until the pavement is laid.

When the guides are withdrawn the idling of the channels is completed, and hot tar or other suitable material is poured in, to form a concrete in the cells or channels, and rammed down in the usual way.

By this inode I am. enabled to lay pavement, with cells or channels extending to the bottom or foundation of the pavement, very rapidly, without securing or attaching the separate blocks to the founuation.

I do not claim the pavement, when completed, as of my invention, as that may be found in the patent heretofore issued to Samuel Nicholson, and to a certain extent described in the English patent of Henry Austin; but

What I claim as new, .and desire to secure by Letters Patent, is-

The guide A, when provided with fingers a a, or open spaces for the admission of gravel,

substantially as specified.

HUGH MCD OUGALL.

Witnesses:

. J. B. TURGHIN,

COLL MCDOUGALL 

